Reef Savvy offers several overflow options including internal, external, glass holes and then I think they can do others as well but not sure. Anyway, when you order a tank, you specify the type of overflow you would like.
The good thing about a glass holes or external oveflow though is that you gain real estate within your tank for aquascaping. I actually like these solutions. You don't have to arrange your rock and corals around the overflow compartment.
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